• Manager admits United are long way behind Spanish powerhouses• Mourinho says United will be humble on their return to Champions League

José Mourinho has compared Manchester United’s struggle in the Champions League to having “a giant on our chest” before their return to the competition.

United lost Tuesday’s Uefa Super Cup 2-1 to Real Madrid, who have won the European Cup for the past two seasons, the first club to do so in the Champions League era. United will enter at the group stage of the tournament when it starts next month.